The vast majority of Americans, then and now, thought the Civil War was 100% necessary and only so long & bloody because some Confederates preferred "extermination" to surrender.
BrexitBen: "you can now move on to World War One.
The New York Times was extremely excited about lying to the populace about why that insane conflict needed U.S. involvement."
The NY Times opposed US entry into WWI until Congress declared war on Germany.
The NY Times did not call for war against Germany in 1915, after a German U-Boat sank the SS Lusitania, killing 1,195 including 128 Americans.
In January 1917, the NY Times supported Pres. Wilson's proposals for "Peace Without Victory".
After Congress declared war on Germany, the NY Times supported the US war effort and Wilson's post-war peace plans, notably the League of Nations.
In the same manner that Stalin had a 100% approval rating. If you criticized the war, the Lincoln administration would put you in prison.
His administration even locked up Septimus Winner for "Treason" because he wrote the song "Give us back our old commander". (About General McClellan) They made him claw back every copy of the song he sold before they would let him go.
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Septimus Winner was a well known song writer of that era. He wrote hits like "Listen to the Mocking bird", "Where oh where has my little dog gone?" "Little Brown Jug", "Ten little Indians", and other music less known to modern ears.
Abraham Lincoln said of "Listen to the Mocking bird" It is as sincere as the laughter of a little girl at play.